The Conservative manifesto for the 2015 general election contained a promise not to raise income tax, VAT, or national insurance for the duration of the parliament. (en.wikipedia.org)
The present Coalition government has pledged not to introduce road pricing for the duration of this Parliament. (politics.co.uk)
For secretaries of state, the committee suggests they remain in place for the duration of a parliament, whereas their ministerial understudies should hold their posts for no less than two years. (totalpolitics.com)